From the Super Mario Wiki
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There are multiple icy platforms in this stage, as well as Icicles on the ceiling in-between the platforms' horizontal positions and solid ground on the bottom of stage as well as some bottomless Pits. Donkey Kong is on the middle platform with Pauline above him. The entire stage is symmetrical, with the exception being the platform with Pauline.
The battle is quite similar to other Donkey Kong fights so far: the player must grab the Barrels that Donkey Kong throws, reach Donkey Kong and throw them at him three times. Donkey Kong's attack pattern is the same as before: he can roll barrels, throw barrels to the sides, and throw barrels straight down, although the player must now account for the icicles and slippery platforms.